Mostly it makes me wonder even more about the failure of the Indians to move up on the civilizational ladder.
An interesting point that echoes my thought. Some years back we visited the Valley of Fire, a Nevada State Park that had some petroglyphs "dating back more than 2,000 years", according to one brochure.
The museum had a lot of artifacts, including a drawing of an Indian woman grinding corn. From the way she dressed, I thought, "Oh, about 100-200 years ago." It turned out to be 2,000 years ago, an artist's conception, based upon the tools found there.
While there can be some slack in someone's "conception", it hit me that in 2,000 years, these people had not advanced, as I had seen photos of similar operations taken in the mid-1800s and couldn't tell the difference.
This was a far cry from similar then-and-now pics of Anglo Saxon development. In one area, I got a kick out of the generational fashion changes of Westerners compared to the sameo-sameo buckskins the Indians wore year in and year out.